I have a Clymer manual for all CB450 models from 1965 to 1971, its in good condition (no greasy fingerprints etc but cover is showing its age ) if you want it you can have it for $20 au or I can put it on ebay

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Turn the air screw and throttle screw all the way inward until they LIGHTLY seat. Now open each of them one and one half turns. That is the factory setting. Chances are the carbs are gummed up with varnish from evaporated gas. Disassemble the carbs and soak them in denatured alcohol for 30 minutes. Now clean them with spray carb cleaner from the auto parts store. You need to be sure all the jets and fuel circuits are clear. You may need a service manual sometime. Here is a website that looks like it may have a free download. Even if they want $20 or so, a service manual is handy to have around. http://www.mediafire.com/?jnyzijmfydw